MSRP relay is an extension to the MSRP protocol (RFC 4975). Its main
role is to help NAT traversal of Interactive Messaging and file transfer
sessions for SIP/MSRP endpoints located behind NAT.

Changelog

Removed per-domain configuration and certificates in favour of detecting
the SIP domain from the To-Path. This assumes SRV records are used to
look up the MSRP relay. This also elimites the need for using the TLS
server name extension.

Removed any references to CAs and CRLs.

Simplified certificate generation.

Cleaned up test script directory.

Added own runtime directory in /var/run to store runtime files.

Added commandline option to specify the name of the config file to read.